Create 특정 세대의 대장균 찾기.sql

Author: jimi567

프로그래머스/sql/select/특정 세대의 대장균 찾기.sql

@@ -0,0 +1,10 @@
+//서브쿼리 join으로도 가능할듯
+SELECT E3.ID
+FROM ECOLI_DATA AS E3
+WHERE E3.PARENT_ID IN (SELECT E2.ID 
+                     FROM ECOLI_DATA AS E2
+                     WHERE E2.PARENT_ID IN (SELECT E1.ID
+                                          FROM ECOLI_DATA AS E1
+                                          WHERE E1.PARENT_ID IS NULL))
+ORDER BY ID                                     
+